Give some people the smallest amount of power

and some of them will abuse it.
I had to go to the Showground yesterday. It was the day we dismantle the display and hand back the exhibits to the competitors.
I had to be there before eight in the morning and I was. I was also wearing the compulsory yellow safety vest - something not necessary a couple of years ago but now "essential". I had my label. It was very obvious that I had come there to do a job. The official (not a member of the Showground staff but an OHS official) did not want to let me in.
And I most certainly was not allowed to ride my tricycle in although there was not a large vehicle in sight - the reason given for not allowing me in.
I explained politely that I had come in this way when we setting up prior to the Show.
"Not through my entrance," I was told. Notice that possessive "my"?
As I was expected to be available at a certain time I gave the OHS official a look and said,
"Thank you for your concern. I will find another entrance."
"You won't get in anywhere."
It was said gleefully.
I knew there would be at least four entrances open yesterday morning. I had just tried to use the one closest to the railway station - the obvious one.
I went on around to the next entrance. There was another OHS official there. He was chatting cheerfully to a couple of workers piling equipment into the back of a van.
He saw me and waved me through with the words, "Mind how you go."
The law does allow me to ride in and I could have argued with the first individual but it was not worth the confrontation. It would just make it difficult for everyone else who wanted to enter for the rest of the day. I recognise this sort of officialdom. They enjoy their power - and should never have been given it. 
I have to admit though - I was very tempted to ride out through that entrance when I left.